asp.net-mvc-3 相关问题

我想在 HTML 帮助器中添加扩展方法来生成这样的选择和选项安道尔... 我想在 HTML 帮助程序中添加扩展方法来生成这样的选择和选项 <select id="Country" name="Country"> <option data-domain="AN" value="1">Andorra</option> <option data-domain="UI" value="2">United Arab Emirates</option> <option data-domain="AF" value="3">Afghanistan</option> 选项有一个数据域属性，我可以这样使用它 @Html.DropDownListFor(m => m.Country, Model.CountryList) Model.CountryList 是国家/地区变量的数组 class Country { public String Text { get; set; } public String Value { get; set; } public String Domain { get; set; } } 请谁能给出解决方案您可以在自定义帮助器方法的帮助下构建您的CustomDropdownListFor，如下所示：自定义辅助方法： public static class CustomHelpers { public class CustomSelectItem : SelectListItem { public string Class { get; set; } public string Disabled { get; set; } public string SelectedValue { get; set; } } public static MvcHtmlString CustomDropdownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<CustomSelectItem> list, string selectedValue, string optionLabel, object htmlAttributes = null) { if (expression == null) { throw new ArgumentNullException("expression"); } ModelMetadata metadata = ModelMetadata.FromLambdaExpression<TModel, TProperty>(expression, htmlHelper.ViewData); string name = ExpressionHelper.GetExpressionText((LambdaExpression)expression); return CustomDropdownList(htmlHelper, metadata, name, optionLabel, list, selectedValue, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes)); } private static MvcHtmlString CustomDropdownList(this HtmlHelper htmlHelper, ModelMetadata metadata, string name, string optionLabel, IEnumerable<CustomSelectItem> list, string selectedValue, IDictionary<string, object> htmlAttributes) { string fullName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name); if (String.IsNullOrEmpty(fullName)) { throw new ArgumentException("name"); } TagBuilder dropdown = new TagBuilder("select"); dropdown.Attributes.Add("name", fullName); dropdown.MergeAttribute("data-val", "true"); dropdown.MergeAttribute("data-val-required", "Mandatory field."); dropdown.MergeAttribute("data-val-number", "The field must be a number."); dropdown.MergeAttributes(htmlAttributes); //dropdown.MergeAttributes(new RouteValueDictionary(htmlAttributes)); dropdown.MergeAttributes(htmlHelper.GetUnobtrusiveValidationAttributes(name, metadata)); StringBuilder options = new StringBuilder(); // Make optionLabel the first item that gets rendered. if (optionLabel != null) options.Append("<option value='" + String.Empty + "'>" + optionLabel + "</option>"); foreach (var item in list) { if (item.SelectedValue == "selected" && item.Disabled == "disabled") options.Append("<option value='" + item.Value + "' class='" + item.Class + "' selected='" + item.SelectedValue + "' disabled='" + item.Disabled + "'>" + item.Text + "</option>"); else if (item.SelectedValue != "selected" && item.Disabled == "disabled") options.Append("<option value='" + item.Value + "' class='" + item.Class + "' disabled='" + item.Disabled + "'>" + item.Text + "</option>"); else if (item.SelectedValue == "selected" && item.Disabled != "disabled") options.Append("<option value='" + item.Value + "' class='" + item.Class + "' selected='" + item.SelectedValue + "'>" + item.Text + "</option>"); else options.Append("<option value='" + item.Value + "' class='" + item.Class + "'>" + item.Text + "</option>"); } dropdown.InnerHtml = options.ToString(); return MvcHtmlString.Create(dropdown.ToString(TagRenderMode.Normal)); } } 视图（剃须刀）： @Html.CustomDropdownListFor(m => m.PersonId, ViewBag.PersonData as List<CustomHelpers.CustomSelectItem>, null, "---- Select ----", new { name = "personId", id = "personId"}) @Html.ValidationMessageFor(m => m.PersonId, null , new { @class = "ValidationErrors" }) 标准 DropDownList/DropDownListFor 助手不支持此功能。如果您需要此类功能，则必须从头开始编写自定义 HTML 帮助程序。您可以查看这个示例。还有另一个。方法： public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListCodeItem> selectList) { var select = new TagBuilder("select"); var options = ""; TagBuilder option; foreach (var item in selectList) { option = new TagBuilder("option"); option.MergeAttribute("value", item.Value.ToString()); option.MergeAttribute("data-domain", item.Code.ToString()); option.SetInnerText(item.Text); options += option.ToString(TagRenderMode.Normal) + "\n"; } select.MergeAttribute("data-val", "true"); select.MergeAttribute("data-val-required", "The field is required."); select.MergeAttribute("id", name); select.MergeAttribute("name", name); select.InnerHtml = options; return new MvcHtmlString(select.ToString(TagRenderMode.Normal)); } 致电： @Html.DropDownList("name" Model.OrganizationTypeList) 稍微重构 Murat 的答案 public static class MvcHelpers { public class CustomSelectItem : SelectListItem { public string Class { get; set; } } public static MvcHtmlString CustomDropdownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<CustomSelectItem> list, string selectedValue, string optionLabel, object htmlAttributes = null) { if (expression == null) { throw new ArgumentNullException(nameof(expression)); } var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData); var name = ExpressionHelper.GetExpressionText(expression); return CustomDropdownList(htmlHelper, metadata, name, optionLabel, list, selectedValue, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes)); } private static MvcHtmlString CustomDropdownList(HtmlHelper htmlHelper, ModelMetadata metadata, string name, string optionLabel, IEnumerable<CustomSelectItem> list, string selectedValue, IDictionary<string, object> htmlAttributes) { var fullName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name); if (string.IsNullOrWhiteSpace(fullName)) { throw new ArgumentException("Name cannot be null or empty.", nameof(name)); } var dropdown = new TagBuilder("select") { Attributes = { { "name", fullName }, { "data-val", "true" }, { "data-val-required", "Mandatory field." }, { "data-val-number", "The field must be a number." } } }; dropdown.MergeAttributes(htmlAttributes); dropdown.MergeAttributes(htmlHelper.GetUnobtrusiveValidationAttributes(name, metadata)); var options = new StringBuilder(); if (!string.IsNullOrEmpty(optionLabel)) { options.Append($ "<option value=''>{optionLabel}</option>"); } foreach (var item in list) { options.Append(CreateOption(item)); } dropdown.InnerHtml = options.ToString(); return MvcHtmlString.Create(dropdown.ToString(TagRenderMode.Normal)); } private static string CreateOption(CustomSelectItem item) { var disabledAttribute = item.Disabled ? "disabled" : string.Empty; var selectedAttribute = item.Selected ? "selected" : string.Empty; return $"<option value='{item.Value}' class='{item.Class}' {disabledAttribute} {selectedAttribute}>{item.Text}</option>"; } }

html asp.net-mvc asp.net-mvc-3 select

回答 0 投票 0

使用分页列表时丢失所有视图模型数据

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.net asp.net-mvc asp.net-mvc-3 pagination pagedlist

回答 2 投票 0

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ajax asp.net-mvc-3 pagination webgrid

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在mvc3 webgrid中实现行号和分页？

我想为网络网格自动生成行号，我可以使用下面的代码来做到这一点 grid.Column(标题：“行号”，格式：item => item.WebGrid.Rows.IndexOf(item) + 1), 问题...

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在模型优先方法上使用分页列表？

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